.btn-file {
    position: relative;
    /*overflow: hidden;*/
}
.btn-file input[type=file] {
    position: absolute;
    top: 0;
    right: 0;
    min-width: 100%;
    min-height: 100%;
    text-align: right;
    opacity: 0;
    /*background: none repeat scroll 0 0 transparent;*/
    /*cursor: inherit;*/
    display: block;
}
